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Post by gift on Mar 16, 2015 11:50:39 GMT -5
Oh thank you for the correction about the valve.
I ordered the 100cc kit and new carb which are here already but I would like to try everything out with stock parts first so I ordered 44mm piston and ring sets. Because I first thought I had the secret 63cc engine. When the 44mm piston came I figured it did not fit in the stock cylinder then I found out the scoot is not secret 63. It is 50cc scoot. I also tried to hone the stock cylinder but the drill I borrowed from my friend has only one speed which is too fast for me to handle the hone properly. I'm going to take the hone and cylinder to my school mechanic shop and see if I can borrow a drill to finish the job.
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Post by gift on Mar 15, 2015 22:20:20 GMT -5
The main jet is really 81. It took me all afternoon to get those 3 sealed screws out to see the 2 jets inside. If typical stock carbs are jet at low to mid 70, then it makes sense that mine had been running rich by the previous owner.
Another thing that I misunderstood this whole time is the secret 63cc. I roughly measured the piston starting from 1cm and saw it ended at close to 5cm so I got excited and thought the piston was 44mm (that was so dumb) but it is actually 39mm. I just found out today after I got new piston and rings to compare the size. So I have 44mm piston and ring sets here that cannot be used...lol
For the valve, I did not measure it when I first took the top end out. I just remembered that it should be 0.03 inch. But it looked like almost 0.5 inch at the time. However I am not sure about this at all. It might just be me that exaggerating of everything I saw in there for the first time.:eek: thank you for the reminder about how to do it. To be honest, I have not carefully checked how to adjust the valve yet. I will sure watch YouTube several times before I do that.
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Post by gift on Mar 15, 2015 16:21:51 GMT -5
I just successfully unsealed the stock carb and found that the jets are 81 and 33 which surprised me. Because the scoot ran rich before while the main jet is only 81. I noticed the gap between valves were really big when I took it apart though. Is it possible that because of the valve but not the carburetor that made the scoot run rich.
I stupidly ordered wrong size piston and rings so I gotta wait again for the correct size to come and assemble the parts back together.
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Post by gift on Mar 13, 2015 10:20:13 GMT -5
I thought I beated him riding a motorcycle with my dad since 2 but he is younger and riding alone...hahaha:p
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Post by gift on Mar 12, 2015 16:51:29 GMT -5
How old is him? He is so cute.
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Post by gift on Mar 11, 2015 23:08:34 GMT -5
I ordered a new carb but I am trying to unseal the stock carb too. I want to put all stock parts back in and try start it up to see before I put all the new parts in.
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Post by gift on Mar 11, 2015 22:12:01 GMT -5
For less than $70 bucks, you can buy a honing tool and a drill, $45 depending on the type and complexity. If you can't find a shop that will do it cheap, watch videos on youtube to see how it's done, and you might be tempted to do it yourself. Here's one that shows how easy it is: Thanks for the video Jerry. I think I am going to buy a hone and borrow my friend drill for this. What do you guys think about this hone? www.ebay.com/itm/2-STONE-MASTER-CYLINDER-BRAKE-HONE-13-16-TO-2-1-2-F-S-/270792644617?pt=LH_DefaultDomain_0&hash=item3f0c7fd809 Would it be enough for my need? Also this scootdawg.proboards.com/thread/49037 looks like he had the same look of piston and cylinder with mine but my piston rings are still intact. (He found out that half of one of the ring was gone) I talked to the previous owner and he could not tell me anything more beside his son said it was not running right  onewheeldrive I already ordered the BBK and new carb. I was rush to order those parts so I can have it by this weekend... I should have waited a bit...Uhhhh!!!! The gasket did fall off and I kept it with the exhaust parts so it was not in the pictures. I put it back in the port now but I will have to clean it up a bit. I took off the CVT plastic case today but could not pull the pulley off to see inside but I think they look fine, just lots of black dust. Anything in particular that I should inspect while I have the case off? |
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Post by gift on Mar 11, 2015 10:31:27 GMT -5
I just hung up with the mechanic shop owner. He thought the top end was bad. I told him I took that off and found that the piston top was all black and covered with carbon. Now I am going to clean that but I need to have the cylinder honed before I put the new ring in. I asked if he could help me with that and he said that is not how we do business. So I asked how much and he said it would be $65-70 EXCLUDING labor work. I think I am done with this shop.
We have another shop in town. I will try to see if I could have the job done over there.
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Post by gift on Mar 10, 2015 22:19:36 GMT -5
Nothing is jumping out at me yet. Are there any deep scratches or anything like that in the cylinder? It looked like there was some scoring on the side of the piston. I'm on my phone, maybe the pics will be bigger on my laptop. Have you looked in the transmission area (cvt) where the belt, clutch, and variator are? It's a bit challenging here because A) we don't know what the symptoms were beforehand B)The mechanic thinks the engine is bad (still in the back of my head-- not convinced either way) C) The top end is off, so were kind of working backwards a bit Usually its check the fuel/carb, air, spark and stuff like the valves/compression.... first. The crank also has two other bearings that can fail-- and can be checked if you take the variator off for one side, and the flywheel off on the other, both by wiggling the shaft on each side checking for play. Yes, I know. My bad! I jumped to deep inside without checking those first few steps. When I got the scooter back from the shop, many things were disconnected and the only thing in my head was bad engine so I rushed to take the engine apart. Now I guess I will try to see if I can get the cylinder honed, clean the piston, take the variator off, and inspect CVT system while waiting for the parts to come. Haha these can keep me occupied for many days. For the cylinder, I did not see any deep scratch inside just the top part in the picture that has about 1-2mm black carbon ring cover. I will try to clean these out tomorrow. |
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Post by gift on Mar 10, 2015 18:12:09 GMT -5
 Sorry the image was not inserted.this is the one I mentioned about top part deposition. |
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Post by gift on Mar 10, 2015 18:00:41 GMT -5
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Post by gift on Mar 10, 2015 17:29:45 GMT -5
I just checked mine roughly from outside. It does not move like the toasted one in the other video so I hope that is a good sign. I also tried turning the fan again and see it moves you can see at the second part of the video. I am going to take more pictures of the cylinder and post it here too. Thanks  |
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Post by gift on Mar 10, 2015 12:43:01 GMT -5
Thanks, I understand you now and the crankshaft insepction you mentioned sounds easier to do but I think will need help on that. I will try this tonight and record video while I'm inspecting it and post it here.
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Post by gift on Mar 10, 2015 11:38:56 GMT -5
if it was my scoot i wouldn't buy any new parts unless i knew they were bad. new piston and cylinder is fine, they are cheap enough but you could clean up the old piston as long as you don't see any scratches on the cylinder, just my opinion. soak in wd40 and you can get most of the carbon off. new parts are fun but they are not always necessary. this scoot only has a 1,000 miles on it and from the looks of it the only problem is it was running rich. put it together and try to get it started imo. then we can trouble shoot what parts may need to be ordered. also, someone mentioned checking the crankshaft to see if it has any play. if you haven't done that yet, i think it is fairly important. good luck, i'll be keeping the rest of my opinions to myself, plenty of better scooter mechanics on this site than me. I will definitely clean the old piston and keep everything as my spare parts. I have not checked the crankshaft yet. I will need to look up for YouTube video on how to do that first lol. Thank you for your suggestions and wishes. I am willing to learn more on this if you could give me any opinions/comments/suggestions, I will really appreciate it. And I am sure everyone here welcomes other opinions too. |
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Post by gift on Mar 9, 2015 22:31:20 GMT -5
I just bought a set of feeler gauge and torque wrench but was hesitated to get an impact wrench. Now I am mad at myself that I didn't get it when it was on sale last weekend.
I am planning to get 100cc (83cc) BBK and a new carb (I tried to unseal the stock carb but it is really hard without proper tools). The stock carb is 19mm but I could not find 21mm carb within my budget. I found a 20mm one which the seller claims that it is set for the BBK but it does not come with the matching intake manifold though.
So I think I will get 19mm keihin (cheaper than the 20mm too) with some different size jets and use the old stock parts I have. This combination will cost me the least.
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